Hey, cloud-skinned, in vain
Though troubled by Kauravas, the one who hates depletion of own family, that Dharmaputhra, decided to lead Krishna to peace and said thus. Minds of noble people are averse to trouble for others.
cloud-skinned* - The one having cloud-like complexion, Sree Krishna
Sudarshana** : is a spinning, disk-like weapon of Lord Vishnu.